Which devices should i use for pre round team select?

HI i want make map with 2 teams - 15 runners and one shooter. I would like do a select by the button press in room. After this press (you have one minute if not press you will be runner) first guy will teleport to shooter room and the rest will be teleport to runners room. And this 10 rounds = 10 press button = 10 shooters (it can be the first one who press button if its easier to do it - i hope its possible)

And i have huge problem how i can do it? I tried with class selector and team setting also with class designer. Can someone help me step by step or at least what kind of device should i use? I work on Unreal Editor and im not using a Verse Code (still learn but its a black magic for now)

Also i wonder is it even possible to respawn someone when shooter left the game?

Thanks in advance.